Malicious PDF — malware analysis report

Static analysis result for SHA-256 f108cc9fa1f8374b…

MALICIOUS

PDF

76.4 KB Created: 2021-06-19 21:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e46f2a253ac7eb61720096238dbaa0a8 SHA-1: ac9731dbfaaf47cb9dd5b18e6a7c38c653a7c6b6 SHA-256: f108cc9fa1f8374bc7046d4d2f7bafde413a8af2a0e2058de61ceb54e46d3807
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=download+logic+pro+x+for+mac+free+full+version PDF link annotation
    • http://tsg-edinstvo.ru/userfiles/file/62357990042.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab2a8ecd6---zapazunesebubof.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0cb2bfe873cce8a20085d6c9b4c2e258/28761689078.pdfIn PDF document text
    • http://iworking.vn/uploads/files/13911133818.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c1999672a---30455937633.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/gimawusaxeworiwefupajudux.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j7qoeci94ji9ap2uublu6mc2nj/26646301276.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/dujik.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210513190028.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/vawoliso.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a95b9bf5468f1f43e0840555f3a5c83/zanutidirinezalelebadun.pdfIn PDF document text
    • http://northcity.rs/slike/files/43098927822.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/durobuloku.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609030969cfb6---ligede.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/pivuxumale.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/konil.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/10491f59768702b4a4c0d2b873ab790a/8732478860.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tu58pu17041q67mf1a64tcfjko/wafolofobevelesiwiwakino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5692 bytes
SHA-256: eeba12d3ad387fa2812395c59e69936b68f34eb3d100c8dd771b804851cf1238
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 11340 bytes
SHA-256: 15b0a2a7320cf708317b1807012e93889c993fc1c53f7b8d421a6994ed4121e8